2011年春夏季江西旱情水文分析

文章介绍了2011年春夏季江西旱情,并对未来旱涝并存的情况作了阐述.     

消防设备电源监控传感模块设计

针对市面上消防设备电源监控传感器采样精度差、通信不稳定、不符合国标规范等设计缺陷,以国家标准GB28184-2011《消防设备电源监控系统》为依据研究设计了一款电流电压型监控传感器。设计创新点在于采用RN8209G芯片进行采样,并通过CAN总线进行通信,在0~50 A电流范围内提高采样精度达到1%。设计产品已通过国标GB28184中4.7节表1中的基础实验及高低温试验要求。     

2010年中国烯烃供需回顾及2011年展望

回顾了2010年我国烯烃的供需状况,并展望了2011年的供需前景.     

Development and validation of an analytical method for the determination of arsenic,cadmium and lead content in powdered infant formula by means of quadrupole Inductively Coupled Plasma Mass Spectrometry

Cadmium (Cd), lead (Pb) and arsenic (As) can enter the food chain through the environment and/or as a consequence of the manufacturing process making foodstuffs the main human exposure route to these chemical elements. The risk associated with this exposure is of such a big concern for human health that the European Food Safety Agency recommends to reduce the exposure to Cd and Pb so as to protect especially vulnerable subgroups of population (e.g., infants). Therefore, the setting of new maximum levels (MLs) for chemical elements in infant formulae (e.g., for Cd) or the reconsideration of the existing ML for Pb is under discussion. On this basis, the availability of analytical methods, precise, accurate and sensitive enough to quantify low concentration values, is a key point especially for official control laboratories that have to state the sample compliance using a fully validated method with an associated uncertainty compliant with the requirements specified in the pertinent regulations. This work describes the development and validation of an analytical method to quantify As, Cd and Pb in powdered infant formulae based on animal protein at values of concentration close to the MLs that are likely to be set. The results obtained make the method suitable for a precise and accurate determination of these chemical elements at these low concentration values. In particular, the results for limit of quantification (LoQ) were respectively (μg kg⁻¹): As 6.2, Cd 1.2 and Pb 4.5. While for the recovery rates the following percentages were obtained: As 105%, Cd 98% and Pb 108%. The expanded uncertainties were found extremely satisfactory (Cd 13% and Pb 19%). The LoQ and the uncertainty for Pb meet the requirements set in Commission Regulation (EC) No. 333/2007 and following amendments being lower than the maximum values allowed. Even for Cd the expanded uncertainty resulted adequate in relation with the low concentration considered.     

2011年国际供电会议系列报道:运行、控制与保护

2011年国际供电会议(CIRED 2011)运行、控制与保护分组安排的活动有:IEC 61850在配电网中的应用专题讲座、162篇论文的宣读和张贴交流以及圆桌讨论会。会议关注的热点问题包括分布式电源并网保护控制与运行管理、IEC 61850的应用、配电自动化、故障定位、小电流接地故障补偿与选线定位以及状态监测技术等。     

中欧火电厂烟气排放规定对比研究

欧盟指令DIRECTIVE 2010/75/EU在国际社会上的认知度较高,文章从适用对象、机组大小划分、燃料类别、标准状态与基准氧含量规定、污染物项目、烟气排放限值、最低脱硫效率等方面,对2010/75/EU指令与中国《火电厂大气污染物排放标准》（GB13223—2011）进行了对比研究,主要结论如下：欧盟污染物控制项目包括SO2、NOx、烟尘和CO,对汞的排放未作要求;燃料及机组类型的划分欧盟较中国细化;欧盟脱硫装置有最低脱硫效率的性能考核;在共有的污染物项目中,中欧排放限值不相上下,某些排放限值中国甚至比欧盟更为严格。     

沙特阿美2011年业务发展简况

简要分析了沙特阿美公司2011年上游、下游及贸易业务的发展情况及2020发展战略。     

商用电开水器单位能耗实验数据处理方法的研究

本文主要研究了商用电开水器单位水量能耗测试数据的处理方法。基于商用电开水器节能认证技术规范CQC3133-2011和测量不确定度的基础知识,利用基本数学理论,分析了函数量均值和均值函数量处理试验数据的区别。